//TODO
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student可以搜索group DONE—result paginate not working
注意在spec_helper.rb中加入config,rspec才能不与solr冲突导致测试失败
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coach可以踢人 DONE
group show显示学生列表,coach可以delete学生
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用户可以互发私信 DONE. only student can send a message to coach
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student可以给coach留review DONE. student can rate the group he/she enrolled in.
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coach可以群发邮件 DONE
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coach可以上传图片,显示图片 DONE
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group添加schedule属性 DONE
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Provide enroll in group as a service